package com.thd.springboottest.webmvcconfigurer.config;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.thd.springboottest.webmvcconfigurer.formatter.BooleanFormatAnnotationFormatterFactory;
import com.thd.springboottest.webmvcconfigurer.formatter.BooleanFormatter;
import com.thd.springboottest.webmvcconfigurer.interceptor.WebInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.format.AnnotationFormatterFactory;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.lang.annotation.Annotation;
import java.util.ArrayList;
import java.util.List;

@Configuration
public class MvcConfig implements WebMvcConfigurer {
    /**
     * 添加静态文件目录
     * @param registry
     */
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {


        registry.addResourceHandler("/st/**")
                .addResourceLocations("classpath:/st/");

        registry.addResourceHandler("/v2/api-docs/**")
                .addResourceLocations("classpath:/META-INF/resources/v2/api-docs/");

    }

    /**
     * 跨域访问
     * @param registry
     */
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT","PATCH")
                .maxAge(3600);
    }

    // WebMvcConfigurerAdapter 这个类在SpringBoot2.0已过时，官方推荐直接实现WebMvcConfigurer 这个接口
    /**
     * 使用fastjson代替jackson
     * @param converters
     */
    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        /*
         先把JackSon的消息转换器删除.
         备注: (1)源码分析可知，返回json的过程为:
                    Controller调用结束后返回一个数据对象，for循环遍历conventers，找到支持application/json的HttpMessageConverter，然后将返回的数据序列化成json。
                    具体参考org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor的writeWithMessageConverters方法
               (2)由于是list结构，我们添加的fastjson在最后。因此必须要将jackson的转换器删除，不然会先匹配上jackson，导致没使用fastjson
        */
        for (int i = converters.size() - 1; i >= 0; i--) {
            if (converters.get(i) instanceof MappingJackson2HttpMessageConverter) {
                converters.remove(i);
            }
        }
        FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter();
        //自定义fastjson配置
        FastJsonConfig config = new FastJsonConfig();
        config.setSerializerFeatures(
                SerializerFeature.WriteMapNullValue,        // 是否输出值为null的字段,默认为false,我们将它打开
                SerializerFeature.WriteNullListAsEmpty,     // 将Collection类型字段的字段空值输出为[]
                SerializerFeature.WriteNullStringAsEmpty,   // 将字符串类型字段的空值输出为空字符串
                SerializerFeature.WriteNullNumberAsZero,    // 将数值类型字段的空值输出为0
                SerializerFeature.WriteDateUseDateFormat,
                SerializerFeature.DisableCircularReferenceDetect ,   // 禁用循环引用
                SerializerFeature.WriteClassName// 写入全类名
        );
        // 日期类型格式化格式
        config.setDateFormat("yyyyMMdd");
        fastJsonHttpMessageConverter.setFastJsonConfig(config);
        // 添加支持的MediaTypes;不添加时默认为*/*,也就是默认支持全部
        // 但是MappingJackson2HttpMessageConverter里面支持的MediaTypes为application/json
        // 参考它的做法, fastjson也只添加application/json的MediaType
        List<MediaType> fastMediaTypes = new ArrayList<>();
        fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);
        fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes);
        converters.add(fastJsonHttpMessageConverter);
    }


    @Autowired
    private WebInterceptor webInterceptor;

    @Override
    /**
     * 定义拦截器
     */
    public void addInterceptors(InterceptorRegistry registry) {
        // 自定义拦截器，添加拦截路径和排除拦截路径
        registry.addInterceptor(webInterceptor).addPathPatterns("/**").excludePathPatterns("/static/**");
    }

    /**
     * 自定义类型转换规则(带有自定义注解的字段)
     * 本功能只适用于POST请求且body中的数据是name=devil13th&age=5&exists=YES的形式 !!!
     * @param registry
     */
    @Override
    public void addFormatters(FormatterRegistry registry) {
        //registry.addFormatterForFieldAnnotation((AnnotationFormatterFactory<? extends Annotation>) new TimestampFormatAnnotationFormatterFactory());
        registry.addFormatterForFieldAnnotation(new BooleanFormatAnnotationFormatterFactory());
        //registry.addFormatterForFieldType(Boolean.class, new BooleanFormatter());

    }
}
